145331987 has 4 divisors (see below), whose sum is σ = 145364976. Its totient is φ = 145299000.

The previous prime is 145331981. The next prime is 145331993. The reversal of 145331987 is 789133541.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (145331981) and next prime (145331993).

It is a cyclic number.

It is not a de Polignac number, because 145331987 - 2⁴ = 145331971 is a prime.

It is a super-2 number, since 2×145331987² = 42242772890736338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145331981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8639 + ... + 19112.

It is an arithmetic number, because the mean of its divisors is an integer number (36341244).

Almost surely, 2^145331987 is an apocalyptic number.

145331987 is a deficient number, since it is larger than the sum of its proper divisors (32989).

145331987 is an equidigital number, since it uses as much as digits as its factorization.

145331987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32988.

The product of its digits is 90720, while the sum is 41.

The square root of 145331987 is about 12055.3717072515. The cubic root of 145331987 is about 525.7594294270.

The spelling of 145331987 in words is "one hundred forty-five million, three hundred thirty-one thousand, nine hundred eighty-seven".